Sarkozy and Georgian President Mikheil Saakashvili had lengthy discussions on the text of a ceasefire agreement, local media said.
Some changes were made to the agreement at Georgia's insistence, Sarkozy said at the press conference, adding that he had contacted Russian President Dmitry Medvedev twice during his talks with Saakashvili in the Georgian capital on Tuesday evening.
The agreement would, among other things, prescribe setting up a humanitarian corridor, Sarkozy said.
After approval by the European Union, the agreement will become a document which has legal effect, he said.
Earlier on Tuesday, Medvedev and Sarkozy agreed in Moscow on six principles for the settlement of the conflict in South Ossetia.
South Ossetia, formerly an autonomous region within Georgia, declared independence from Georgia in the early 1990s and it has been controlled by a secessionist government since then. But its independence has not been internationally recognized.
On Friday, Georgian troops and armour entered a South Ossetian-controlled territory and began shelling Tshinvali. On the same day, Russian troops moved into the region to aid its peacekeepers there.
